/Engine/Source/Runtime/CoreUObject/Public/UObject/UObjectGlobals.h
Sets the class to use for a subobject defined in a nested subobject, the class must be a subclass of the class used when calling CreateDefaultSubobject.
template<class T> const [FObjectInitializer](API\Runtime\CoreUObject\UObject\FObjectInitializer) & SetNestedDefaultSubobjectClass ( FStringView SubobjectName ) const